#include stdio<>
main()
{
int a,b;
scantf("%d",&a);
b=abc(a);
printf("/%d/=%d\n",a,b);
}
int abc(x)
int x;
{
int y;
if(x>0) y=x;
esle y=-x;
return(y);
}
------------------------------------------------
VC++中运行结果 ：
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(1) : error C2006: #include expected a filename, found 'identifier'
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(5) : error C2065: 'scantf' : undeclared identifier
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(6) : error C2065: 'abc' : undeclared identifier
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(7) : error C2065: 'printf' : undeclared identifier
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(9) : error C2065: 'x' : undeclared identifier
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(10) : error C2448: '<Unknown>' : function-style initializer appears to be a function definition
c:\documents and settings\administrator\桌面\vc++练习\cpp1.cpp(10) : fatal error C1004: unexpected end of file found
执行 cl.exe 时出错
----------------------------------------------------------
找不出哪里错了，但是放到TC 2.0中运行成功      
疑惑  大侠们帮我看看，谢谢

#include stdio<>
这句就错了
#include <stdio>

嗯  改了  运行还是错的

Compiling...
Cpp1.cpp
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(6) : error C2065: 'abc' : undeclared identifier
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(9) : error C2065: 'x' : undeclared identifier
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(10) : error C2448: '<Unknown>' : function-style initializer appears to be a function definition
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(10) : fatal error C1004: unexpected end of file found
执行 cl.exe 时出错.

ompiling...
Cpp1.cpp
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(6) : error C2065: 'abc' : undeclared identifier
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(9) : error C2065: 'x' : undeclared identifier
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(10) : error C2448: '<Unknown>' : function-style initializer appears to be a function definition
C:\Documents and Settings\Administrator\桌面\VC++练习\Cpp1.cpp(10) : fatal error C1004: unexpected end of file found
执行 cl.exe 时出错.

Cpp1.obj - 1 error(s), 0 warning(s)
   

再帮我看看，谢谢~

scanf打错了。。头文件错了。。
printf("/%d/=%d\n",a,b);这一句你是想干什么？输出a，b？

 fatal error C1004: unexpected end of file found没有期待的结束。。
少了一对花括号吧

scanf改回来了 还是那样。。晕

printf("/%d/=%d\n",a,b);/*输出"/a/=b"*/

int abc(x)
{int x;
int y;
if(x>0) y=x;
esle y=-x;
return(y);
}
#include <stdio.h>
  int main()
{
  int a,b;
  scanf("%d",&a);
  b=abc(a);
  printf("%d,%d\n",a,b);
}

#include <stdio.h>
main()
{
    int abc(int x);
    int a,b;
    scanf("%d",&a);
    b=abc(a);
    printf("%d=%d\n",a,b);
}
int abc(int x)
{
    int y;
    if(x>0) y=x;
    else y=-x;
    return(y);
}

楼主多看些书吧

输出改改看看